David Pattyn / Zanzibar red colobus monkey (Procolobus kirkii) crossing the main road through the Reserve, Jozani forest, Jozani Chwaka Bay NP, Zanzibar, Tanzania, August.

David Pattyn / Zanzibar red colobus monkey (Procolobus kirkii) portrait in a tree, Jozani forest, Jozani Chwaka Bay NP, Zanzibar, Tanzania, August

Enrique Lopez-Tapia / Zanzibar red colobus (Piliocolobus kirkii) in tree, Jozany Forest, Zanzibar, Tanzania. Highly endangered. Did you know? Zanzibar red colobuses are called 'Poison monkeys' by the local people on the is...

Bernard Castelein / Zanzibar Red Colobus (Procolobus kirkii) head portrait, Jozani Chwaka Bay NP, Zanzibar, Tanzania

Bernard Castelein / Zanzibar Red Colobus (Procolobus kirkii) jumping through the air, Jozani Chwaka Bay NP, Zanzibar, Tanzania

Bernard Castelein / Zanzibar Red Colobus (Procolobus kirkii) relaxing on tree branch, Jozani Chwaka Bay NP, Zanzibar, Tanzania

Bernard Castelein / Zanzibar Red Colobus (Procolobus kirkii) juvenile, sitting in tree calling, Jozani Chwaka Bay NP, Zanzibar, Tanzania

Bernard Castelein / Zanzibar Red Colobus (Procolobus kirkii) mother with offspring, sitting in tree, Jozani Chwaka Bay NP, Zanzibar, Tanzania

Bernard Castelein / Zanzibar Red Colobus (Procolobus kirkii) head portrait of infact, sitting with mother, Jozani Chwaka Bay NP, Zanzibar, Tanzania

Pete Oxford / Kirk's red colobus (Procolobus kirkii) Jozani Forest Reserve, Zanzibar, Tanzania

Pete Oxford / Kirk's red colobus (Procolobus kirkii) in tree feeding, Jozani Forest Reserve, Zanzibar, Tanzania

Anup Shah / Zanzibar red colobus monkey (Procolobus kirkii) mother with young, Zanzibar, Tanzania, East Africa